摘要： 分析了试验地区夏玉米在降雨年型为一干旱年的需水与耗水规律.结果表明,试验条件下,夏玉米全生育期需水量为359.8 mm.夏玉米日需水强度呈抛物线型,苗期较小,拔节到抽雄达到最大,抽雄到灌浆后需水强度逐渐减小.土体供水在耗水来源组成中所占比例很小,甚至出现负供水.但是在某个生长发育阶段,特别是出现水分胁迫的条件下,土体供水可在玉米耗水组成中占主导地位.

关键词: 夏玉米, 水量, 耗水量, 耗水规律

Abstract: In this study, rules of water demands and consumption by summer maize were analyzed.T here is a totaLwater demand of 359.8 mm during the whole growth stage of maize.Daily water demand in the whole growth period appeared to be a parabola:low in seedling stage, increased untiLreach its peak while from node elongation to tasseling and decreased gradually after tasseling and grain filling.RainfalLand irrigation provides most of water consumed by summer maize, while soiLwater supply con-tributes little, in some cases, there is even minus supply.But when some certain growth stage was in-spected, especially when there is a water stress, soiLwater supply may be the main source and contribut-ed much.

Key words: Summer maize, Water demand, Consumption, Rules

中图分类号: 

• S513.01